this post was submitted on 06 Jul 2025
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There's no radiator, it's a heat exchanger.
You have two sections in your heat exchanger. One part wants the cooling agent cold so it can effectively imterchange heat from your room into the cooling liquid. The other part wants the cooling agent hotter than the air outside so it can effectively dissipate the heat to the outside. To achieve that the liquid gets compressed. On the cold side it gets cooled with airflow.
I don't think sunlight will change anything significant in that mechanism.
I think it’ll have an effect. If you think of the cross section of the piping in the condenser (radiator in the outside unit shown in photo), you have heat trying to transfer from the fluid on the inside diameter, through the pipe wall, then to the air surrounding the outer diameter.
Heat has to flow from hot to cold, so ideally you have a gradient from hot to cold going from inside to outside.
But suppose the sun intensely heats that pipe wall and it ends up higher than either fluid on either side of it. Now you’ve got heat flowing from the wall to both inside and outside.
Not saying that ever happens, but every degree warmer that the pipe wall is, is a slow down in the heat transfer rate. Less of a gradient for the heat flow.
That makes sense. I was completely focused on only the device.
...I hate the be the one to tell you this but there are two radiators in a heat pump. The condenser and the evaporator are both evaporators.
While they both interchange heat, the principle of evaporators and radiators is different.
Did you add that to prove yourself wrong?
probably just a brain fart - they've both heat exchangers.